What specific cranial feature acts as a natural shock absorber against drumming forces?

Answer

Spongy, porous bone tissue situated between the bill and the skull

Woodpeckers possess spongy, porous bone tissue located between the bill and the skull structure which functions to dampen the extreme vibrations from impacts.

What specific cranial feature acts as a natural shock absorber against drumming forces?
birdanatomyphysical characteristicwoodpeckerbeak